Crimson Trace Corporation, RAD Co-Witness Mount, Black WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 6061 Anodized Aluminum CT RAD and Doctor Pattern Footprint Full co-witness pic rail mount made from aerospace grade aluminum and tailored to fit the CT RAD and CT RAD Pro, it is also compatible with the Docter Footprint. This mount also fits the CTS-1250 and CTS-1300. Combine your favorite CT Red Dot to get a full co-witness sight picture using this mount. The Mount fits most MILSPEC M1913 style Picatinny Rails.